Partitioning of radio-frequency apparatus

US7221921B2 · kind B2 · utility

Assignee

• Silicon Laboratories Inc. · US

Inventors

• James Maligeorgos · Austin, US
• Augusto Marques · Austin, US
• Lysander Lim · Austin, US
• G. Tyson Tuttle · Austin, US
• Aslamali A. Rafi · Austin, US
• Tod Paulus · New York, US
• Gregory Uehara · Kaneohe, US
• Jeffrey W. Scott · Austin, US
• Richard T. Behrens · Louisville, US
• Donald A. Kerth · Austin, US
• G. Diwakar Vishakhadatta · Austin, US
• Vishnu Srinivasan · Austin, US
• Caiyi Wang · Austin, US

Key dates

• Filing date: Dec 8, 2003
• Grant date: May 22, 2007
• Expiry date: Oct 7, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03J2200/10
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Components of a radio-frequency (RF) apparatus including transceiver circuitry and frequency modification circuitry of a crystal oscillator circuit that generates a reference signal with adjustable frequency may be partitioned in a variety of ways, for example, as one or more separate integrated circuits. The frequency modification circuitry may be implemented as part of a crystal oscillator circuit that includes digitally controlled crystal oscillator (“DCXO”) circuitry and a crystal. The frequency modification circuitry may include at least one variable capacitance device and may be employed to generate a reference signal with adjustable frequency. The adjustable reference signal may be provided to other components of the RF apparatus and/or the RF apparatus may be configured to provide the adjustable reference signal to baseband processor circuitry. Automatic frequency control (AFC) circuitry may be integrated with other components of RF circuitry and may generate frequency control signals for the frequency modification circuitry based on, for example, a signal received from a temperature sensor. Digital-to-analog converter (DAC) circuitry may be integrated with other components…